Being the nerd that I am I have to question weather this is about percentiles (if you are a 1 then you are in the bottom 10 percentile in terms of autism severity and if you are a 9 then you are in the top 10 percentile) or if it's a scale of absolute severity, and if the latter is true then is it linear or logarithmic? This is not a scientific thing by any means so I will just ignore that (against my every instinct) and guess.

I would have to say I'm somewhere between 3 and 4, mostly because I'm to the point where can't mask very well so my weirdness is quite apparent to the casual observer and I can't really effectively mask but I am most definitely level 1 severity.